XP laptop suddenly not showing up in network on windows 7 desktop

[shaun5142]

Hi,
I have 3 computers: 1)Desktop running Windows 7 connected to a router. 2)XP Laptop. 3)New laptop running windows 10.

I have sharing between all 3. Suddenly today the XP laptop does not show up in the Network on the Windows 7 Desktop. The new Windows 10 Laptop shows up. The XP laptop does show up in the Network of the Windows 10 Laptop and I can access files.

I would appreciate any help in why this happened and how to get it back.
Thanks

 

[shaun5142]

Well, it has suddenly reappeared for no apparent reason. After about 3 hours.